TL;DR: API-first environments increasingly rely on service accounts, OAuth tokens, API keys, and AI agents, but many security teams still monitor users and logins rather than token issuance and usage, creating persistent blind spots, according to Token Security. Token-centric governance is now the practical boundary between nominal API protection and enforceable access control.
At a glance
What this is: This blog argues that API-first security fails when teams can see human logins but not the tokens that actually carry access across workloads, SaaS, and AI-driven systems.
Why it matters: IAM and security teams need token-level visibility because token issuance, reuse, and reuse-after-compromise can bypass controls built around users, sessions, and login audits.
Context
API-first security means the primary access path is no longer a person logging in, but a token presented by a service account, workload, integration, or AI agent. That changes the governance problem from authenticating people to governing machine-issued credentials and the access they can repeatedly mint.
The control gap is straightforward: many programmes still watch logins, MFA events, and user sessions while the real activity happens through token issuance and token use. Once tokens become the portable credential for cloud and SaaS access, visibility into them becomes a prerequisite for least privilege, incident response, and compliance evidence.
The article’s core claim is that token visibility is not an enhancement to API security but the layer that makes access governable in the first place. Without it, organisations can have policies on paper while unmanaged machine identities continue to exercise access beneath the surface.
Key questions
Q: What breaks when security teams can see logins but not tokens?
A: Identity governance loses the ability to distinguish legitimate human access from continuous machine-issued access. In API-first environments, the token is the actual bearer of privilege, so login-centric monitoring misses the real control plane. That gap weakens least privilege, incident investigation, and compliance evidence at the same time.
Q: When do short-lived access tokens still leave organisations exposed?
A: Short-lived tokens still leave organisations exposed whenever the attacker can use the token before it expires or can refresh it through a stolen refresh token. Expiry reduces exposure window, but it does not prove the token holder is legitimate. Behavioural detection and binding controls are still needed.
Q: How can organisations tell whether token governance is actually working?
A: Token governance is working when every live token has a named owner, a bounded purpose, and a clear runtime signal that shows whether it is being used inside its intended context. If security teams cannot answer who owns the token, what it can access, and when it should be cut off, the governance model is incomplete.
Q: Should organisations prioritise token governance over broader API policy work?
A: Yes, when token-based access is the dominant path into cloud and SaaS systems. API policy without token governance controls the doorway but not the credential that moves through it. The practical sequence is to establish token inventory, minting control, and usage visibility first, then refine broader API policy.
Technical breakdown
Why API gateways do not provide token governance
An API gateway can mediate requests at the edge, but it does not create a complete control plane for token lifecycle, privilege scope, or post-issuance behaviour. In API-first environments, the decisive security object is often the token itself, because it can be copied, replayed, reused, or minted again by the same identity. That means authentication success at the gateway can coexist with uncontrolled downstream access. The architectural problem is not that APIs lack policy, but that policy is often blind to the token once it leaves the issuing context.
Practical implication: govern token inventory and usage, not just API entry points.
Why short-lived tokens still create persistent access
Short-lived credentials reduce the window of exposure only if the attacker cannot keep reissuing them. When a compromised service account or workload can request fresh tokens on demand, expiration becomes a scheduling detail rather than a security boundary. This is the same failure pattern that appears when machine identities operate continuously without human-paced review: the access path looks legitimate because every individual token is valid. The control problem is therefore not token lifetime alone, but whether token minting itself is governed and observable.
Practical implication: track who can mint tokens repeatedly and under what conditions.
Why machine identities break human-centric monitoring
Most monitoring stacks were built around users, sessions, and login events, so they naturally over-explain human behaviour and under-explain machine behaviour. Service-to-service calls, OAuth grants, and automation activity often bypass the signals that SIEM and IAM teams rely on for user-centric review. In that gap, machine identities become unmanaged access paths rather than governed principals. Visibility has to shift from who logged in to which identity requested a token, how often it did so, and what it accessed after issuance.
Practical implication: extend detection logic to token usage, privilege drift, and service-to-service call patterns.
Threat narrative
Attacker objective: The attacker wants durable, legitimate-looking access that survives token expiration and evades controls built around human login oversight.
- Entry occurs when an attacker compromises a container or other workload that already holds a service account credential. Credential access follows when the attacker extracts the service account material and begins requesting fresh tokens from the platform. Escalation appears when those newly minted tokens are used repeatedly without alerting, giving the attacker continuous legitimate access rather than a one-time foothold. Impact is persistent access to critical systems and data while normal telemetry continues to look authorized.
Breaches seen in the wild
- Dropbox Sign breach 2024: A compromised back-end service account gave attackers Dropbox Sign customer data, including API keys, OAuth tokens and MFA information.
- Salesloft OAuth token breach: hackers stole OAuth tokens to access Salesforce data via Salesloft.
Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.
NHI Mgmt Group analysis
Token visibility is the missing control plane for API-first security: access governance fails when organisations can see identity events but not token issuance, token reuse, or token-driven service calls. In API-first architectures, the token is the actual unit of authority, so human-centric monitoring creates an illusion of control. Practitioners should treat token telemetry as a first-class governance requirement, not a forensic afterthought.
Short-lived token design does not solve persistent machine access: a token that expires quickly still enables durable compromise if the underlying service account can mint new tokens indefinitely. That is not a rotation problem in the abstract, it is a control-boundary problem at issuance time. The implication is that governance must extend to the authority that creates tokens, not just the tokens themselves.
Machine identities have become the blind spot between IAM and API security: many programmes still separate identity governance from API runtime oversight, even though the same service account can power both. This disconnect leaves no single owner for token inventory, token privilege, or token abuse detection. The practitioner conclusion is that API-first security only becomes enforceable when identity and runtime governance are managed as one control surface.
Token-centric governance is now the practical definition of least privilege in cloud and SaaS environments: the traditional assumption was that access could be understood from account permissions alone. That assumption breaks when every useful action is mediated by reusable tokens across services, scripts, and AI-driven workflows. Teams should redefine least privilege around token scope, token minting rights, and runtime usage boundaries.
Persistent access paths demand continuous control, not periodic review: access review cadences are too slow for environments where machine identities can create and consume tokens continuously. A review can certify an account, but it may miss the way that account behaves once token minting begins. Security leaders should expect the centre of gravity to move from periodic attestation to real-time governance over issuance and use.
From our research library:
- Only 5.7% of organisations have full visibility into their service accounts, according to the Ultimate Guide to NHIs.
- NHIs outnumber human identities by 25x to 50x in modern enterprises, according to the Ultimate Guide to NHIs.
- Read next: SaaS-to-SaaS and OAuth App Governance Guide
What this signals
Token visibility is becoming the governance boundary for API-driven environments: organisations that can inventory and monitor tokens will have a materially better chance of enforcing least privilege across cloud workloads, SaaS integrations, and automation. The practical shift is from asking whether an identity is authenticated to asking whether its issued tokens are still justified, observable, and revocable.
Machine identity sprawl changes the operating model for IAM teams: when non-human identities outnumber people by 25x to 50x, periodic reviews alone cannot keep pace with credential issuance and reuse. Teams should expect token-level telemetry to become part of access governance, detection, and compliance evidence rather than a separate security project.
For practitioners
- Inventory all active tokens Build a real-time inventory of tokens across cloud, SaaS, CI/CD, microservices, and AI-driven workflows so security teams can identify unmanaged access paths.
- Monitor token issuance and reuse Track which identities request tokens, how often they mint them, and whether the same credential can be used continuously without human review.
- Enforce privilege at minting time Limit which service accounts, workloads, and integrations can obtain tokens, and scope those tokens to the minimum access needed for the task.
- Correlate runtime token activity Feed token usage into SIEM and detection rules so abnormal request rates, unusual locations, and unexpected service-to-service calls are visible.
- Revoke unused machine credentials Remove stale credentials and tokens that no longer have a clear owner or business purpose, especially in environments where automation can keep them alive.
Key takeaways
- API-first security fails when token issuance and usage are invisible, because the real access path is the token rather than the human login.
- Service accounts and other machine identities can keep minting valid tokens, which turns short-lived credentials into persistent access channels.
- Security teams need token inventory, runtime monitoring, and minting controls to make least privilege enforceable in cloud and SaaS environments.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10, OWASP API Security Top 10 and MITRE ATT&CK address the attack and risk surface, while NIST CSF 2.0 sets the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 — Secret Leakage | Token exposure and exfiltration are central to the article's risk model. |
| NHI-05 — Overprivileged NHI | The article repeatedly warns that tokens often carry more access than teams can see. | |
| NHI-07 — Long-Lived Secrets | The post argues that token expiry alone does not stop persistent access when minting continues. | |
| Recommendation — Scan for leaked tokens and revoke exposed machine credentials immediately. Reduce token scope to the minimum access required and review excess privilege regularly. Treat repeated token minting as a lifecycle risk and govern the issuing identity, not just expiry. | ||
| OWASP API Security Top 10 | API2 — Broken Authentication | Tokens are the authentication object in API-first environments, and blind spots undermine assurance. |
| Recommendation — Verify token issuance, validation, and revocation paths across every API trust boundary. | ||
| NIST CSF 2.0 | PR.AA-05 — Access Permissions, Entitlements and Authorizations | The article is fundamentally about governing entitlements and authorizations at token level. |
| Recommendation — Map token scope and service permissions to PR.AA-05 and remove excessive access paths. | ||
| MITRE ATT&CK | TA0006;TA0008 — Credential Access; Lateral Movement | The attack pattern centers on stolen machine credentials enabling repeated access and spread. |
| Recommendation — Model token theft and reissuance as credential access and lateral movement in detection content. | ||
Key terms
- Token visibility: Token visibility is the ability to inventory, monitor, and explain how credentials are issued and used across machine-driven systems. It includes knowing where tokens live, which identities mint them, what scopes they carry, and whether their use matches expected behaviour across cloud, SaaS, and automation.
- Machine Identity: The digital identity of a machine, device, or workload, such as a server, container, or VM, used to authenticate it within a network. Sometimes used interchangeably with NHI, though NHI is the broader category.
- Token Minting: Token minting is the act of creating a signed identity artefact that other systems accept as proof of authentication or authorization. In a compromised issuer, minting becomes the line between a backend defect and enterprise-wide impersonation.
- Runtime Token Governance: Governance that focuses on token issuance, usage, and revocation while the system is running, rather than only during periodic review. For machine identities, this is often the point where least privilege either becomes real or remains only a policy statement.
Deepen your knowledge
NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building or maturing an IAM programme, it is worth exploring.
Published by the NHIMG editorial team on May 30, 2026.
Updated on October 6, 2026.
NHI Mgmt Group, the independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org